It might interest you to know that Windows screen reader developers used Office's COM object models to make the Office apps (especially the primary document vie

It might interest you to know that Windows screen reader developers used Office's COM object models to make the Office apps (especially the primary document views) accessible for a long time, going back to the early 2000s or late 90s. The third-party Windows screen readers (i.e. everyone but Narrator) are just now transitioning to using UI Automation for Office documents. Microsoft's original accessibility API, Active Accessibility, was way too simplistic, and even UIA only recently became rich and extensible enough to expose everything that screen readers got out of the Office object models.